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scsi: arcmsr: Fix doorbell status being updated late on ARC-1886 

It is possible for the IOP to be delayed in updating the doorbell
status. The doorbell status should not be 0 so loop until the value
changes.

Link: https://lore.kernel.org/r/afdfdf7eabecf14632492c4987a6b9ac6312a7ad.camel@areca.com.tw
Signed-off-by: ching Huang <ching2048@areca.com.tw>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
ching Huang 2021-05-20 14:55:15 +08:00 committed by Martin K. Petersen
parent 2a38d2a8b4
commit d9a231226f
1 changed files with 9 additions and 2 deletions
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11
drivers/scsi/arcmsr/arcmsr_hba.c
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@ -2419,10 +2419,17 @@ static void arcmsr_hbaD_doorbell_isr(struct AdapterControlBlock *pACB)
static void arcmsr_hbaE_doorbell_isr(struct AdapterControlBlock *pACB)
{
uint32_t outbound_doorbell, in_doorbell, tmp;
uint32_t outbound_doorbell, in_doorbell, tmp, i;
struct MessageUnit_E __iomem *reg = pACB->pmuE;
in_doorbell = readl(&reg->iobound_doorbell);
if (pACB->adapter_type == ACB_ADAPTER_TYPE_F) {
for (i = 0; i < 5; i++) {
in_doorbell = readl(&reg->iobound_doorbell);
if (in_doorbell != 0)
break;
}
} else
in_doorbell = readl(&reg->iobound_doorbell);
outbound_doorbell = in_doorbell ^ pACB->in_doorbell;
do {
writel(0, &reg->host_int_status); /* clear interrupt */